Aqueous polyurethane-polyurea dispersion

An aqueous polyurethane-polyurea dispersion comprising polyurethane-polyurea, wherein the polyurethane-polyurea is a reaction product comprising

• a. at least one aliphatic polyisocyanate and at least one cycloaliphatic polyisocyanate with a weight ratio of the at least one aliphatic polyisocyanate to the at least one cycloaliphatic polyisocyanate in the range of 10:1 to 20:1,
• b. a polymer having a structure of formula I:
• wherein n is 10 to 75, R1 is an alkyl group containing 1 to 10 carbon atoms, and R2 is a moiety containing at least two isocyanate-reactive groups;
• c. a polyol other than component b), which has a hydroxyl functionality of 1.5 to 4;
• d. a silane compound comprising one isocyanate-reactive group and at least two methoxy or ethoxy groups attached to a silicon atom of the silane compound;
• e. a hydrophilic compound, different than polymer b), comprising 2 to 3 isocyanate-reactive groups;
• and
• optionally
• f. a compound comprising 1 to 3 amino and/or hydroxyl groups.